GNU Wget is a utility for noninteractive download of
files from the Web. It supports HTTP and FTP
protocols, as well as retrieval through HTTP
proxies. It can follow HTML links, download many
pages, and convert the links for local viewing. It
can also mirror FTP hierarchies or only those files
that have changed. Wget has been designed for
robustness over slow network connections; if a
download fails due to a network problem, it will
keep retrying until the whole file has been
retrieved.

Site Checker can be used to find broken links in
Web pages. First, it retrieves the list of all
pages of the Web site, either static pages or
dynamic pages generated from data stored in a
database. Then it checks the links in each of the
pages to verify if they are on the list. Links to
external sites can also be verified by performing
HTTP requests to the remote Web servers to check
whether the pages still exist.

HTTrack is an easy-to-use offline browser utility. It allows you to download a Web site from the Internet to a local directory, building recursively all directories, getting HTML, images, and other files from the server to your computer. HTTrack arranges the original site's relative link-structure. Simply open a page of the mirrored Web site in your browser, and you can browse the site from link to link, as if you were viewing it online. HTTrack can also update an existing mirrored site, and resume interrupted downloads. WebHTTrack is a Web-based GUI for HTTrack.

urlwatch is a script intended to help you watch
URLs and get notified (via email) of any changes.
The change notification will include the URL that
has changed and a unified diff of what has
changed. The script works out of a single
directory, so there is no need to install
anything. State files are kept in the same folder.
The script supports stripping parts of a page that
are always changing through the use of a filter
hook function. It is typically run as a cronjob.

RabbIt is a mutating, caching Web proxy used to
speed up surfing over slow links like modems. It
does this by removing advertising and background
images and scaling down images to low quality
JPEGs. RabbIT is written in Java and should be
able to run on any platform. It does depend upon
an image converter if image scaling is on. The
recommended image converter is "convert" from the
ImageMagick package.

FPSE clone is a Microsoft Frontpage Server Extensions clone. FPSE is should work with nearly any web server, because it is a regular CGI written in perl. It is also more secure than its Microsoft counterpart, because it does not require SUID priviledges.

SEO SpyGlass Professional is a feature-rich backlink analysis software for webmasters and SEOs who need to outrank their competition in all major search engines. SEO SpyGlass unearths your competitors' link-building strategies and lets you capitalize on their best optimization techniques. On the basis of competition research, the software develops a sure-winning step-by-step optimization plan that will lead your website to the top of Google and other search engines. This software is also available within SEO PowerSuite, which includes WebSite Auditor, LinkAssistant, and Rank Tracker as well.

SEO SpyGlass Enterprise is a feature-rich backlink analysis software for professional SEOs and webmasters. The tools provide the deepest possible insight into your competitors' link building strategies. It lets you milk your competitors of their most SEO-productive backlink sources and use these sources in your own SEO campaign. You'll check all backlinks for Google PageRank and Alexa Rank, scrutinize the used anchor texts and URLs, discover how many backlinks come from forums and blogs, from homepages, from DMOZ-listed sites and much more. The software generates 5 types of reports that can be further printed out, sent to your clients by e-mail or made available on a Web site. You can brand your reports with a company logo and set their color schemes and data layout. This software is also available within SEO PowerSuite, which includes WebSite Auditor, LinkAssistant, and Rank Tracker as well.